Underfeed-stoker furnace



J. H. ROACH.

UNDERFEED STOKER FURNACE.

APPLICATION FILED'MAR. 22, fans.

1,:M6A65, Patented July 13, 1920.

3 SHEETS-SHEET 1.

vwamtop Josek Roach a. H. RQACH.

UNDERFEED STOKER FURNACE."

APPLICATION FILED MAR.22, I919.

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3 SHEETS-SHEET 2.

gmvamoz I JosephHRoach J. H. ROACH.

UNDERFEED SIOKER FURNACE.

APPLICATION FlLED MAR. 22, I919.

Patented July 13, 1920;

3 SHEETSSHEET 3.

mwiloz Roach,

JOSEPH H. ROACH, F BROOKLINE, PENNSYLVANIA.

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Specification of Letters latent.

Patented July i3, i926 Application filed March 22, 1919. Serial No. 284L384.

To aZZ whom it may concern:

Be it known that l, JOSEPH H. ROACH, a citizen of the United States, residing at Brookline, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Improvements in Underfeed-Stoker Furnaces, of which the following is a specification.

My said invention consists in certain improvements in the construction of details and arrangement of parts of under-feed stoker furnaces, the structure being in the main, however, of the same general character as that shown in my co-pending application No. 176,240.

The purpose of the present invention is chiefly to provide a more efficient grate and one by which the fuel bed will be more thoroughly broken up and agitated during the operation of the furnace, and means for operating the same, all as will hereinafter be more fully described and claimed.

Referring to the accompanying drawings,

which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a sectional view through the hopper, the fuel feeding apparatus and one end of the furnace,

Fig. 2, a cross section through a furnace v constructed in accordance with my said in vention,

Figs. 3, land 5, detail. views illustrating the connections for operating the grate bars,

6, a top or plan View of the showing the arrangement of the different types of bars employed therein, and

Fig. Y, a detail of a portion. of Fig. 2 on an en a scale. I

wings the portions marked it.

side walls of the furnace; IE, I trons for the sides of the furnace and C, the midway supports,

:?e is divided into side ash p .o the walls A, side chambers it), al air chamber 11 by appropriate "ad walls as is usual. The air *att regulating devices, and er controlling and dividing the air ClTtEloo, all of substantially the form of my abo. mentioned application. e grates consist of a series of reciprocat g bars 12, a series of stationary bars 13 and a number of slicer bars 1%. in Fig. :6 l have and a c partitions a chambers, t

- shown one reciprocatingbar on each side of the grate, four reciprocating bars in the middle, and six stationary bars between the middle reciprocating bars and each side reciprocating bar. The two central bars of each series of six stationary bars are recessed on their adjacent sides and a slicer bar 14 is mounted in said recess. lVhile l deem this particular arrangement as one that is peculiarly advantageous in operation yet I do not wish to limit myself to such an arrangement, as it is apparent that various modifications may be employed without materially changing the operation or result. For example, the reciprocating bars and stationary bars may be arranged with a different number in each group, or may alternate throughout the grate, and the slicer bars may be arranged differently in relation to the other bars, or a different number of slicer bars may be employed, or all reciprocating bars may be omitted and the grate confined to dead bars and slicer bars.

in any arrangement the bars are mounted as most clearly indicated in Fig. 2. (in the right-hand side of Fig. 2 l have shownthe connection between the rock shaft and a slicer bar it, and also between said roclr shaft and a reciprocating bar 12. @n the leftihand side, however, the view is taken to show the reciprocating bar in elevation and the connection with the rock shaft 20 is more clearly illustrated. llach slicer bar 14 is mounted at its outer end on the curved upper edge of a partition 21, being recessed to fit on and embrace said curved upper edge. it also is provided with a son ntal flange 22 adapted to fit in substantially formed segmental groove in the adjacent side faces of the sta bars, thus furnish g a secure s pport i this end of the bar and a guide for its and down movement.

u ai rm" f i As lll the application a ovc reicireo. to, t etching apparatus comprises a ram 2 f perated by a piston in a cylinder 25, by

aropriate power medium.

a short depending vertical sha nich is attached a rod 2? ca M pusher blocks 28, which are monitor r bottom of the retort to reccat forth and to teed the fuel to said retort in the usua lower end of the shaft 26 1 o of links which in turn are one end with a pair of levers mounted on pivots 31 on each side of the 7 other ends at said are pivoted to links 32 each of which is connected to an arm The rant 33 one of which depends from each rock shaft 20. Spacing blocks 40 are interposed between the ends of arms 33 and shoulders on links 32 to enable the motion of the slicer bars to be regulated to meet furnace conditions. It will thus be seen that as the ram 24: is reciprocated by the cylinder 25 the rock shafts 20 are oscillated and through their connection with the reciprocating grate bars 12 reciprocate said bars back and forth on the upper edges of the partitions on which they rest. Said rock shafts are also connected by links 34: to the slicer bars 14;, said links being pivoted at one end to the inner end of the slicer bars and at their other ends to a radial projection on one side of said rock shaft, so that the oscillation of the rock shafts vibrates said slicer bars up and down at the same time they reciprocate bars 12 back and forth. As will be seen, especially by an examination, of Fig. 5, each movement of the plunger operates through the toggle and link connection to impart a double motion to the slicer bar. This is important inasmuch as it prevents undue exposure of the slicer bars to the extreme heat of the fuel bed and their rapid destruction by burning which would result. By the arrangement shown the slicer bars are raised into the fuel bed by each stroke of the plunger but are immediately returned, by the same stroke, to between the other grate bars where they are protected from such burning or fusing.

llhis motion of the slicer bars serves to completely break up the fuel bed and keep it from packing and also tends to distribute the coal transversely across the grate bars so that the most advantageous results are obtained. Aside from the operation of the grate, as thus described, the operation of the apparatus is practically the same as that shown in my application before mentioned, and the length of stroke is varied by employing or omitting the spacer blocks 40 or by moving them to either side of the arms Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent is:

1. A grate for an unferfeed stoker furnace composed of a series of juxtaposed grate bars, part of which are stationary and part of which are mounted to reciprocate, a slicer bar mounted for movement in a vertical plane between adjacent stationary bars and about acenter located approximately at the lower end of said slicer bar, a reciprocating ram adapted to move the fuel into combustimesses ble relation to said grate, and means connecting the ram and slicer bar whereby the slicer bar is elevated twice foreach completed cycle of operation of the ram.

2. A grate bar for under-feed stoker furnaces composed of a plurality of juxtaposed grate bars, certain groups of which are stationary and other groups mounted to reciprocate, a slicer bar mounted between members of one of the stationary groups and adapted to oscillate in a vertical plane upon a center adjacent its lower end, and a rock shaft for simultaneously reciprocating the reciprocating bars and oscillating the slicer bar.

3. A grate for an underfeed stoker furnace comprising a supporting partition having a rounded upper edge, a plurality of stationary bars resting upon the partition a plurality of reciprocating bars mounted to slide upon the partition, a slicer bar fitting over and upon the rounded edge of the partition and adapted to oscillate upon said rounded edge as a center, a reciprocating ram adapted to move fuel into combustible relation to said grate, and means connecting the ram and slicer bar whereby the slicer bar is elevated twice for each complete cycle of operation of the ram.

at. A grate for an under-feed stoker furnace comprising a supporting partition, :1;

group of stationary bars bearing upon the partition, a group of reciprocating bars slidably mounted to reciprocate upon the partition, a slicer bar mounted to oscillate upon the partition as a center and introduced between members of a stationary group adjacent members of which are provided with segmental grooves having the center of curvature of the partition as their centers, and lugs formed upon the slicer 1 bar introduced and movable within the segmental grooves 5. A grate for under-feed stoker fur naces comprising a support, spaced stationary bars having adjacent faces with segi mental slots whose centers are located in the support, la slicer bar introduced between the stationary bars and provided with lugs introduced and movable in the segmental slots, and means to operate the slicer bar upon the support as a center.

In witness whereof, I, have hereunto set my hand and seal at Philadelphia, Pennsylvania, this 21st day of March, A. D. nineteen hundred and nineteen.

JUSEPH H. RUACH. [Ls] Witness:

R. M. RED/10K. 

